CN109738116B - Calibration method and device for flexible pressure sensor - Google Patents
Calibration method and device for flexible pressure sensor Download PDFInfo
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Abstract
The invention discloses a calibration method and device of a flexible pressure sensor, which comprises a pressure-bearing platform, an L-shaped support and a base, wherein the L-shaped support is of an L-shaped structure, a rectangular sliding rail is arranged on the inner surface of one side surface of the L-shaped support, the L-shaped support is connected with the pressure-bearing platform through the rectangular sliding rail, a pressure gauge is vertically connected with one side surface of the L-shaped support, the upper surface of the pressure-bearing platform is provided with the flexible pressure sensor, the pressure gauge is matched with the flexible pressure sensor in space, and a resistance measuring instrument is arranged on one side of the upper surface of the pressure-bearing platform. According to the invention, the main control unit and the driving control module are arranged, and when the numerical value acquired by the pressure gauge reaches the set target value in the calibration process of the flexible pressure sensor, the main control unit sends a stop action instruction to the driving control module, so that manual intervention is not needed in the whole calibration process, and the human resources are saved.
Description
Technical Field
The invention relates to the technical field of sensor calibration, in particular to a method and a device for calibrating a flexible pressure sensor.
Background
Along with the continuous development of modern electronic technology and information technology, intelligent electronic equipment is increasingly appeared in people's life, and intelligent level improvement needs to rely on big data analysis and artificial intelligence, and the collection of big data is not separated from the use of sensor, and flexible pressure sensor is as a novel sensor, has the advantage of pliability, thickness are little, flexible, sensitivity is high, with low costs, has extensive application prospect.
Because of the characteristics of the flexible pressure sensor, corresponding calibration is required in the product testing and using processes, the method mainly adopted for calibrating the pressure sensor at present is to perform linear fitting based on the least square method principle to obtain an approximate curve, but the method is suitable for the pressure sensor with good linearity, when the relation between the pressure and the resistance of the pressure sensor does not meet the linearity, a plurality of calibration points are required to be selected for multi-line segment fitting, the selection of a plurality of line segments is often difficult, and when the selected line segments are fewer, larger errors exist in part intervals; when the number of the selected line segments is large, the number of the calibration points is increased, so that the calibration process is more complex. Based on the defects, the invention provides a calibration method and calibration equipment for a flexible pressure sensor, and the problems are properly solved.
Disclosure of Invention
The invention discloses a calibration method and a calibration device for a flexible pressure sensor, which can automatically calibrate the flexible pressure sensor without manual intervention in the process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
according to the technical scheme provided by the invention: the utility model provides a calibrating device of flexible pressure sensor, includes pressure-bearing platform, L type support and base, L type support is "L" shape structure, the interior table wall of a side of L type support is provided with the rectangle slide rail, interconnect through the rectangle slide rail between L type support and the pressure-bearing platform, a side of L type support is connected with the manometer perpendicularly, pressure-bearing platform's upper surface is provided with flexible pressure sensor, manometer and flexible pressure sensor match each other in the space, pressure-bearing platform's upper surface one side is provided with resistance measuring apparatu, pressure-bearing platform's lower surface middle part is fixed to be provided with linear bearing guide rail, the upper surface middle part of base is fixed to be provided with worm gear and worm conversion case, interconnect through the lead screw between linear bearing guide rail and the worm gear conversion case, the upper surface of base is provided with servo motor and control box, servo motor's lower surface is provided with the blotter, servo motor's one end extends to the inside of worm conversion case, the worm of servo motor one end and the cooperation contact of lead screw lower extreme worm wheel, one side of control box has the display module through the connection interface.
As a further improvement of the invention, a main control unit, a driving control module and a data management unit are arranged in the control box.
As a further improvement of the invention, the screw rod is in a threaded connection structure relative to the linear bearing guide rail and the worm gear box, and the screw rod is in a rotatable structure relative to the linear bearing guide rail and the worm gear box.
As a further improvement of the invention, a worm wheel and a worm are arranged in the worm gear-worm conversion box, and one end of the servo motor is connected with the screw rod through the worm, the worm wheel and the screw rod through mutual threads.
As a further improvement of the invention, the flexible pressure sensor is formed by combining a first flexible substrate, a flexible electrode layer, a supporting layer, a second flexible substrate, a pressure sensitive layer and a flexible packaging layer, wherein the pressure sensitive layer is arranged on the lower surface of the second flexible substrate, the flexible electrode layer is arranged on the upper surface of the first flexible substrate, the pressure sensitive layer is connected with the flexible electrode layer through the supporting layers on two sides, and the flexible packaging layer covers the edges of the first flexible substrate and the second flexible substrate.
As a further improvement of the invention, the flexible pressure sensor is electrically connected with the resistance measuring instrument through an electrical output signal, the resistance measuring instrument and the pressure gauge are both connected with the main control unit, the main control unit is respectively provided with a driving control module and a data management unit, the main control unit is in bidirectional connection with the data management unit, the driving control module is connected with the servo motor, and the data management unit is respectively electrically connected with the communication interface and the display module.
As a further improvement of the invention, a calibration method and a device of a flexible pressure sensor, the device comprises the following specific operation steps:
step one, a main control unit reads information of a flexible pressure sensor to be calibrated and set point sequence data from a data management unit;
step two, reading a first set point pressure value and setting the first set point pressure value as a target value of the current action;
step three, the main control unit sends an action instruction to the drive control module; the driving control module executes instructions to drive the platform to move upwards, so that contact pressure is generated between the flexible pressure sensor and the pressure gauge;
step four, the main control unit reads data of the pressure gauge, and when the real-time pressure value reaches a target pressure value, the main control unit sends a stop action instruction to the drive control module so as to maintain the surface pressure of the flexible pressure sensor at the target value;
and fifthly, the main control unit reads the resistance value of the flexible pressure sensor measured by the resistance measuring instrument, and records the reading of the resistance value when the pressure value is stable and equal to the target value and the resistance value is stable.
Step six, reading the next set point pressure value, and repeatedly executing the step two to the step five until all the pressure point data in the set point sequence are executed;
and step seven, the resistance sequence data obtained by measurement and the corresponding pressure point sequence data are stored in a data management unit.
As a further improvement of the present invention, a calibration method and apparatus for a flexible pressure sensor, the calibration method comprising the steps of:
and carrying out calculation fitting on the resistance sequence data and the corresponding pressure point sequence data stored in the data management unit according to the following steps:
1. the sequence of pressure points is recorded as follows: y0, y1, … yn; recording the sensor resistance sequences x0, x1, … xn;
2. taking the resistance value sequence as an abscissa and the pressure value sequence as an ordinate, and obtaining a pressure-resistance pair sequence: (x 0, y 0), (x 1, y 1) … (xn, yn);
3. solving a fitting curve of the pressure sensor by adopting a least square polynomial curve fitting method:
a) Substituting the sequence pairs obtained in 2 into a polynomial equation:
obtaining an equation set:
b) Solving the equation by adopting a Gaussian elimination method to obtain a polynomial coefficient W 0 ,W 1 ,W 2 ,…W n
c) Substituting the polynomial coefficient into the polynomial (1) to obtain a fitting function formula of the sensor,
4. and saving the obtained fitting function polynomial coefficients in a data management unit as calibration parameters in one-to-one correspondence with the sensor information.
The obtained calibration parameters can be used for calculating the calibration coefficient of the pressure when the sensor is applied, and the pressure measurement precision is improved.
As a further improvement of the present invention, the curve fitting method employs polynomial fitting.
As a further improvement of the invention, the solving polynomial equation set adopts a gaussian elimination method.
Compared with the prior art, the invention has the following advantages:
1) According to the invention, the resistance measuring instrument, the flexible pressure sensor to be measured and the pressure gauge are arranged on the pressure-bearing platform, after the pressure-bearing platform is fixedly arranged on the external structure, the driving control module controls the servo motor to drive the pressure-bearing platform and the L-shaped support to drive the pressure-bearing platform to move from the zero pressure just in contact to the position corresponding to the appointed target pressure, the main control unit can read the resistance value of the flexible pressure sensor measured by the resistance measuring instrument and the pressure value acquired by the pressure gauge in real time, and the calibration data obtained in the whole process are calculated and fit according to a polynomial method, and finally the calibrated result is displayed on the display module and stored in the data management unit.
2) According to the invention, the main control unit and the driving control module are arranged, and when the numerical value acquired by the pressure gauge reaches the set target value in the calibration process of the flexible pressure sensor, the main control unit sends a stop action instruction to the driving control module, so that manual intervention is not needed in the whole calibration process, and the human resources are saved.
3) The device is provided with the communication interface and the display module which are connected with the computer, so that the functions of data import and export, calibration analysis, calibration curve display and the like can be realized, and the device is practical in function and suitable for wide popularization.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a bottom view of the present invention.
Fig. 3 is a schematic view of the internal structure of the flexible pressure sensor of the present invention.
Fig. 4 is a schematic diagram of the circuit connection of the present invention.
In the figure: 1. a rectangular slide rail; 2. a pressure-bearing platform; 3. a flexible pressure sensor; 4. an L-shaped bracket; 5. a resistance measuring instrument; 6. a linear bearing rail; 7. a screw rod; 8. a servo motor; 9. a cushion pad; 10. a worm gear and worm conversion box; 11. a base; 12. a control box; 13. a pressure gauge; 14. a flexible encapsulation layer; 15. a support layer; 16. a second flexible substrate; 17. a pressure sensitive layer; 18. a flexible electrode layer; 19. a first flexible substrate; 20. a main control unit; 21. a drive control module; 22. a communication interface; 23. a data management unit; 24. and a display module.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1-4, a calibrating device for a flexible pressure sensor comprises a pressure-bearing platform 2, an L-shaped support 4 and a base 11, wherein the L-shaped support 4 is of an L-shaped structure, a rectangular sliding rail 1 is arranged on the inner surface of one side of the L-shaped support 4, the L-shaped support 4 and the pressure-bearing platform 2 are connected with each other through the rectangular sliding rail 1, a pressure gauge 13 is vertically connected with one side of the L-shaped support 4, the flexible pressure sensor 3 is arranged on the upper surface of the pressure-bearing platform 2, the pressure gauge 13 and the flexible pressure sensor 3 are mutually matched in space, a resistance measuring instrument 5 is arranged on one side of the upper surface of the pressure-bearing platform 2, a linear bearing guide rail 6 is fixedly arranged in the middle of the lower surface of the pressure-bearing platform 2, a worm gear and worm gear conversion box 10 is fixedly arranged in the middle of the upper surface of the base 11, the linear bearing guide rail 6 is mutually connected with the worm and the worm gear conversion box 10 through a lead screw 7, a servo motor 8 and a control box 12 are arranged on the upper surface of the base 11, a 9 is arranged on the lower surface of the servo motor 8, the shape of the servo motor 9 is the worm gear conversion box is the shape of the reverse motor, the worm gear 8 is provided with a cushion pad, and the worm gear conversion box 8 extends to one end of the servo motor is connected with one end of a display module 22 through the worm connection end of the worm gear box 24 and the servo box and is connected with one end of the control box 24.
As shown in fig. 1, a main control unit 20, a driving control module 21 and a data management unit 23 are disposed in the control box 12, the main control unit 20 controls the relative position between the pressure-bearing platform 2 and the L-shaped bracket 4 through the driving control module 21, reads out the pressure value and the corresponding resistance value acting on the flexible pressure sensor 3, and stores the pressure value and the corresponding resistance value in the data management unit 23.
As shown in fig. 1 and 2, the screw rod 7 is in a threaded connection structure relative to the linear bearing guide rail 6 and the worm gear box 10, the screw rod 7 is in a rotatable structure relative to the linear bearing guide rail 6 and the worm gear box 10, and the pressure-bearing platform 2 can move up and down relative to the L-shaped bracket 4 by means of the linear bearing guide rail 6 and the worm gear box 10.
As shown in fig. 1, a worm wheel and a worm are arranged in the worm gear-worm conversion box 10, one end of the servo motor 8 is connected with the screw rod 7 through the worm, the worm wheel and the screw rod, and the worm gear-worm conversion box 10 is arranged to change the power transmission direction.
As shown in fig. 3, the flexible pressure sensor 3 is formed by combining a first flexible substrate 19, a flexible electrode layer 18, a supporting layer 15, a second flexible substrate 16, a pressure sensitive layer 17 and a flexible packaging layer 14, wherein the pressure sensitive layer 17 is mounted on the lower surface of the second flexible substrate 16, the flexible electrode layer 18 is mounted on the upper surface of the first flexible substrate 19, the pressure sensitive layer 17 is connected with the flexible electrode layer 18 through the supporting layers 15 on two sides, the flexible packaging layer 14 covers the edges of the first flexible substrate 19 and the second flexible substrate 16, and the arrangement of the flexible packaging layer 14 on the edge can play a role in waterproof and dustproof.
As shown in fig. 4, the flexible pressure sensor 3 is electrically connected with the resistance measuring instrument 5 through an electrical output signal, the resistance measuring instrument 5 and the pressure gauge 13 are both connected with the main control unit 20, the main control unit 20 is respectively provided with a driving control module 21 and a data management unit 23, the main control unit 20 is in bidirectional connection with the data management unit 23, the driving control module 21 is connected with the servo motor 8, and the data management unit 23 is respectively electrically connected with the communication interface 22 and the display module 24.
As shown in fig. 1, 3 and 4, a calibration method and device for a flexible pressure sensor, the device specifically comprises the following operation steps:
step one, the main control unit 20 reads the information of the flexible pressure sensor 3 to be calibrated and set point sequence data from the data management unit 23;
step two, reading a first set point pressure value and setting the first set point pressure value as a target value of the current action;
step three, the main control unit 20 sends an action instruction to the drive control module 21; the driving control module 21 executes instructions to drive the platform to move upwards, so that contact pressure is generated between the flexible pressure sensor 3 and the pressure gauge 13;
step four, the main control unit 20 reads the data of the pressure gauge 13, and when the real-time pressure value reaches the target pressure value, the main control unit 20 sends a stop action instruction to the drive control module 21 so as to maintain the surface pressure of the flexible pressure sensor 3 at the target value;
and fifthly, the main control unit 20 reads the resistance value of the flexible pressure sensor 3 measured by the resistance measuring instrument 5, and records the reading of the resistance value when the pressure value is stable and equal to the target value and the resistance value is stable.
Step six, reading the next set point pressure value, and repeatedly executing the step two to the step five until all the pressure point data in the set point sequence are executed;
and step seven, the resistance sequence data obtained by measurement and the corresponding pressure point sequence data are stored in a data management unit.
As shown in fig. 1, 3 and 4, a calibration method and device for a flexible pressure sensor, the calibration method includes the following steps:
and carrying out calculation fitting on the resistance sequence data and the corresponding pressure point sequence data stored in the data management unit according to the following steps:
1. the sequence of pressure points is recorded as follows: y0, y1, … yn; recording the sensor resistance sequences x0, x1, … xn;
2. taking the resistance value sequence as an abscissa and the pressure value sequence as an ordinate, and obtaining a pressure-resistance pair sequence: (x 0, y 0), (x 1, y 1) … (xn, yn);
3. solving a fitting curve of the pressure sensor by adopting a least square polynomial curve fitting method:
a) Substituting the sequence pairs obtained in 2 into a polynomial equation:
obtaining an equation set:
b) Solving the equation by adopting a Gaussian elimination method to obtain a polynomial coefficient W 0 ,W 1 ,W 2 ,…W n
c) Substituting the polynomial coefficient into the polynomial (1) to obtain a fitting function formula of the sensor,
4. and saving the obtained fitting function polynomial coefficients in a data management unit as calibration parameters in one-to-one correspondence with the sensor information.
The obtained calibration parameters can be used for calculating the calibration coefficient of the pressure when the sensor is applied, and the pressure measurement precision is improved.
As shown in fig. 1-4, wherein the curve fitting method employs polynomial fitting.
As shown in fig. 1-4, wherein the system of solution polynomial equations employs gaussian elimination.
It should be noted that, in the calibration, firstly, according to the characteristics of the flexible pressure sensor 3 to be detected, a pressure calibration point sequence y0, y1, … yn is determined in the range of the flexible pressure sensor 3, secondly, the main control unit 20 sends an action command to the servo motor 8 to drive the pressure-bearing platform 2 to move upwards, pressure is sequentially applied to the flexible pressure sensor 3, after the pressure value measured by the pressure gauge 13 reaches the calibration point pressure value yn and is stable, the resistance sequence x0, x1, … xn in the flexible pressure sensor 3 is read by the resistance measuring instrument 5, and the obtained pressure-resistance pair sequence (x 0, y 0), (x 1, y 1), (xn, yn) is substituted into the polynomial equationAnd solving an equation by adopting a Gaussian elimination method to obtain a fitting function formula of the sensor, and finally completing the calibration of the flexible pressure sensor 3.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The utility model provides a calibrating device of flexible pressure sensor, includes pressure-bearing platform (2), L type support (4) and base (11), its characterized in that: the L-shaped support (4) is of an L-shaped structure, a rectangular sliding rail (1) is arranged on the inner surface wall of one side surface of the L-shaped support (4), the L-shaped support (4) and the pressure-bearing platform (2) are connected with each other through the rectangular sliding rail (1), a pressure gauge (13) is vertically connected with one side surface of the L-shaped support (4), a flexible pressure sensor (3) is arranged on the upper surface of the pressure-bearing platform (2), the pressure gauge (13) and the flexible pressure sensor (3) are mutually matched in space, a resistance measuring instrument (5) is arranged on one side of the upper surface of the pressure-bearing platform (2), a linear bearing guide rail (6) is fixedly arranged in the middle of the lower surface of the pressure-bearing platform (2), a worm gear-worm conversion box (10) is fixedly arranged in the middle of the upper surface of the base (11), the linear bearing guide rail (6) and the worm gear conversion box (10) are connected with each other through a screw rod (7), a servo motor (8) and a control box (12) are arranged on the upper surface of the base (11), a buffer pad (9) is arranged on the lower surface of the servo motor (8), the buffer pad (9) is in the shape of the buffer pad, the buffer pad (8) extends to one end of the buffer pad (8), a worm at one end of the servo motor (8) is in fit contact with a worm wheel at the lower end of the screw rod (7), and one side of the control box (12) is connected with a display module (24) through a communication interface (22);
a main control unit (20), a driving control module (21) and a data management unit (23) are arranged in the control box (12); the flexible pressure sensor (3) is formed by combining a first flexible substrate (19), a flexible electrode layer (18), a supporting layer (15), a second flexible substrate (16), a pressure sensitive layer (17) and a flexible packaging layer (14), wherein the pressure sensitive layer (17) is arranged on the lower surface of the second flexible substrate (16), the flexible electrode layer (18) is arranged on the upper surface of the first flexible substrate (19), the pressure sensitive layer (17) is connected with the flexible electrode layer (18) through the supporting layers (15) on two sides, and the flexible packaging layer (14) covers the edges of the first flexible substrate (19) and the second flexible substrate (16); the flexible pressure sensor (3) is electrically connected with the resistance measuring instrument (5) through an electrical output signal, the resistance measuring instrument (5) and the pressure gauge (13) are both connected with the main control unit (20), the main control unit (20) is respectively provided with a driving control module (21) and a data management unit (23), the main control unit (20) is in bidirectional connection with the data management unit (23), the driving control module (21) is connected with the servo motor (8), and the data management unit (23) is electrically connected with the communication interface (22) and the display module (24) respectively;
the calibration method of the calibration device comprises the following specific operation steps:
step one, a main control unit (20) reads information of a flexible pressure sensor (3) to be calibrated and set point sequence data from a data management unit (23);
step two, reading a first set point pressure value and setting the first set point pressure value as a target value of the current action;
step three, the main control unit (20) sends an action instruction to the drive control module (21); the driving control module (21) executes an instruction, and the driving platform moves upwards, so that contact pressure is generated between the flexible pressure sensor (3) and the pressure gauge (13);
step four, the main control unit (20) reads data of the pressure gauge (13), and when the real-time pressure value reaches a target pressure value, the main control unit (20) sends a stop action instruction to the drive control module (21) so as to maintain the surface pressure of the flexible pressure sensor (3) at the target value;
step five, the main control unit (20) reads the resistance value of the flexible pressure sensor (3) measured by the resistance measuring instrument (5), and records the reading of the resistance value when the pressure value is stable and equal to the target value and the resistance value is stable;
step six, reading the next set point pressure value, and repeatedly executing the step two to the step five until all the pressure point data in the set point sequence are executed;
step seven, the resistance sequence data obtained by measurement and the corresponding pressure point sequence data are stored in a data management unit;
the calibration method comprises the following steps:
and carrying out calculation fitting on the resistance sequence data and the corresponding pressure point sequence data stored in the data management unit according to the following steps:
(1) The sequence of pressure points is: y0, y1, … yn; recording the sensor resistance sequences x0, x1, … xn;
(2) Taking the resistance value sequence as an abscissa and the pressure value sequence as an ordinate, and obtaining a pressure-resistance pair sequence: (x 0, y 0), (x 1, y 1) … (xn, yn);
(3) Solving a fitting curve of the pressure sensor by adopting a least square polynomial curve fitting method:
a) Substituting the sequence pairs obtained in (2) into a polynomial equation:
obtaining an equation set:
b) Solving the equation by adopting a Gaussian elimination method to obtain a polynomial coefficient W 0 ,W 1 ,W 2 ,…W n
c) Substituting the polynomial coefficient into the polynomial (1) to obtain a fitting function formula of the sensor,
(4) And saving the obtained fitting function polynomial coefficients in a data management unit as calibration parameters in one-to-one correspondence with the sensor information.
2. A flexible pressure sensor calibration device according to claim 1, wherein: the screw rod (7) is of a threaded connection structure relative to the linear bearing guide rail (6) and the worm gear conversion box (10), and the screw rod (7) is of a rotatable structure relative to the linear bearing guide rail (6) and the worm gear conversion box (10).
3. A flexible pressure sensor calibration device according to claim 1, wherein: the worm gear and worm gear conversion box (10) is internally provided with a worm gear and a worm, and one end of the servo motor (8) is connected with the screw rod (7) through the worm, the worm gear and the mutual threads.
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| CN113959635A (en) * | 2021-09-02 | 2022-01-21 | 中国科学院合肥物质科学研究院 | Hydraulic type calibration device and method for flexible force-sensitive sensor array |
| CN114577393B (en) * | 2022-02-25 | 2024-08-02 | 中信戴卡股份有限公司 | Vertical three-component dynamic plate load sensor force value calibration device |
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